.book {
	position: relative;
	min-width:50px;
  min-height:100px;
	max-width:100px;
	max-height:200px;
	perspective: 1000px;
	margin: 20px auto 0 auto;
	transform-style: preserve-3d;
}

.book > ul {
	margin: 0;
	padding: 0;
	list-style: none;
}

.book > a {
	color: #888;
	text-decoration: none;
}

.btn {
	display: block;
	margin-top:40px;
	font-size: 12pt;
	font-weight: bold;
	padding: 0 10px;
	text-align: center;
	transition: color 0.3s, border-color 0.3s;
}

.btn:hover {
	color: red;
}


/* 颜色等与起始位置 */
.hardcover_front > li,
.hardcover_back > li {
	background-color: #aaa;
}

.book_spine > li {
	background-color: #666;
}

.page > li {
	background: linear-gradient(to right, #bbb 0%, #fffbec 100%);
	border-radius: 0px 5px 5px 0px;
	border: 3px solid #ccc;
}


.hardcover_front {
	transform: rotateY(-33deg);
}

.hardcover_back {
	transform: rotateY(-15deg);
}

.page > li:nth-child(1) {
	transform: rotateY(-20deg);
}

.page > li:nth-child(2) {
	transform: rotateY(-23deg);
}

.page > li:nth-child(3) {
	transform: rotateY(-26deg);
}

.page > li:nth-child(4) {
	transform: rotateY(-29deg);
}

.page > li:nth-child(5) {
	transform: rotateY(-32deg);
}

/* 3D翻页 */
.hardcover_front,
.hardcover_back,
.book_spine,
.page,
.page li,
.hardcover_front li,
.hardcover_back li,
.book_spine li {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	transform-style: preserve-3d;
}

.hardcover_front{
	transition: all 0.8s ease;
	transform-origin: 0% 100%;
}

.book_spine {
	transform: rotateY(60deg) translateX(-5px) translateZ(-10px);
	width: 15px;
}

.page > li {
	height: 98%;
	transition: all 0.8s ease;
	transform-origin: left center;
}


/* 翻页动作 */
.book:hover > .hardcover_front {
	transform: rotateY(-145deg);
}

.book:hover > .page li:nth-child(1) {
	transform: rotateY(-30deg);
	transition-duration: 1.5s;
}

.book:hover > .page li:nth-child(2) {
	transform: rotateY(-35deg);
	transition-duration: 1.8s;
}

.book:hover > .page li:nth-child(3) {
	transform: rotateY(-100deg);
	transition-duration: 1.6s;
}

.book:hover > .page li:nth-child(4) {
	transform: rotateY(-110deg);
	transition-duration: 1.4s;
}

.book:hover > .page li:nth-child(5) {
	transform: rotateY(-130deg);
	transition-duration: 1.2s;
}
